[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20170525170455.GA6904@embeddedgus>
Date: Thu, 25 May 2017 12:04:55 -0500
From: "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To: Stefan Wahren <stefan.wahren@...e.com>,
Ulf Hansson <ulf.hansson@...aro.org>,
Florian Fainelli <f.fainelli@...il.com>,
Ray Jui <rjui@...adcom.com>,
Scott Branden <sbranden@...adcom.com>,
bcm-kernel-feedback-list@...adcom.com,
Eric Anholt <eric@...olt.net>
Cc: linux-mmc@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
"Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH v2] mmc: bcm2835: fix potential null pointer dereferences
Null check at line 1165: if (mrq->cmd), implies that mrq->cmd might
be NULL.
Add null checks before dereferencing pointer mrq->cmd in order to avoid
any potential NULL pointer dereference.
Addresses-Coverity-ID: 1408740
Tested-by: Stefan Wahren <stefan.wahren@...e.com>
Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
Changes in v2:
Change subject to make it clear the patch is bcm2835 related.
drivers/mmc/host/bcm2835.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
index 1f343a4..abba9a2 100644
--- a/drivers/mmc/host/bcm2835.c
+++ b/drivers/mmc/host/bcm2835.c
@@ -1172,7 +1172,10 @@ static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq)
if (mrq->data && !is_power_of_2(mrq->data->blksz)) {
dev_err(dev, "unsupported block size (%d bytes)\n",
mrq->data->blksz);
- mrq->cmd->error = -EINVAL;
+
+ if (mrq->cmd)
+ mrq->cmd->error = -EINVAL;
+
mmc_request_done(mmc, mrq);
return;
}
@@ -1194,7 +1197,10 @@ static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq)
readl(host->ioaddr + SDCMD) & SDCMD_CMD_MASK,
edm);
bcm2835_dumpregs(host);
- mrq->cmd->error = -EILSEQ;
+
+ if (mrq->cmd)
+ mrq->cmd->error = -EILSEQ;
+
bcm2835_finish_request(host);
mutex_unlock(&host->mutex);
return;
@@ -1207,7 +1213,7 @@ static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq)
if (!host->use_busy)
bcm2835_finish_command(host);
}
- } else if (bcm2835_send_command(host, mrq->cmd)) {
+ } else if (mrq->cmd && bcm2835_send_command(host, mrq->cmd)) {
if (host->data && host->dma_desc) {
/* DMA transfer starts now, PIO starts after irq */
bcm2835_start_dma(host);
--
2.5.0
Powered by blists - more mailing lists